Laundry appliance with energy saving feature

ABSTRACT

A vertical axis clothes washing appliance is configured to meet predetermined energy and water usage factors by establishing a balance between water temperature, water level, and wash performance parameters. In accordance with the overall invention, additional controls for the washing machine enable an energy saving hot wash cycle to be established, with this wash cycle being designed to automatically establish a wash temperature which is intermediate warm and hot water temperature settings.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention pertains to the art of laundry appliancesand, more specifically, to the incorporation of an energy saving featurein a clothes washing machine.

[0003] 2. Discussion of the Prior Art

[0004] In a clothes washing appliance, it is necessary for a consumer toestablish parameters for a desired operating cycle. For instance, eitherbefore or after loading a tub of a washing machine with clothes to belaundered, the user must typically establish a desired wash level, awash temperature, and an operating time for a particular cycle.Typically, these selections are made through various rotatable, slidingand/or push button controls provided on a control panel of theappliance. However, other control arrangements, such as a touch screencontrol, have also been proposed.

[0005] In general, there exists in the art two major designs or modelsfor clothes washing machines, i.e., horizontal axis and vertical axiswashing machines respectively. Horizontal axis machines operate on thegeneral premise of tumbling a load of clothes through a relatively smallamount of water contained in the tub of the machine. That is, theclothes are continually directed through, lifted from, and thenre-directed through the water. On the other hand, a vertical axiswashing machine requires a greater amount of water for a particular washload and operates to agitate the clothes for cleaning purposes.

[0006] In addition to requiring less water on a per wash load basis,horizontal axis washing machines are generally more efficient from anenergy usage standpoint than vertical axis washing machines. Based onpromulgated government regulations, energy efficiency or star ratingshave been established for clothes washing machines. In order to receivean energy star rating, a clothes washer must therefore meet certainenergy and water usage factors. At present, the government establishedvalues are 1.26 KWH per cubic foot of wash volume (EF) and 11.0 gallonsper cubic foot (WCF). Given the inherent energy efficiencies associatedwith horizontal axis washing machines, higher energy ratings are moreeasily achieved. Unfortunately, this is not the case in connection withvertical axis washing machines. However, achieving the energy starrating is still important to the viability of a vertical axis washingmachine. Based on the above, there exists a need for a vertical axiswashing machine which is configured in a manner which enables the energystar rating to be achieved, while still meeting consumer needs.

SUMMARY OF THE INVENTION

[0007] The present invention pertains to a vertical axis washing machineconfigured to meet predetermined energy and water usage factors. Moreparticularly, a vertical axis washing machine constructed in accordancewith the invention operates by establishing a balance between watertemperature, water level, and wash performance. In accordance with theoverall invention, additional controls for the washing machine enable anenergy saving hot wash cycle to be established, with this wash cyclebeing designed to automatically establish a wash temperature which isintermediate warm and hot water temperature settings. Furthermore,maximum and minimum wash water levels are predetermined to meet theenergy savings goal.

[0008] In accordance with the most preferred form of the invention, amaximum wash level is set at approximately 19.0 gallons, while a minimumwash level is set at 8.25 gallons. With respect to water temperatures,the energy savings temperature is established at 90° F., based on a hottemperature of approximately 120° F., a warm temperature ofapproximately 75° F., and a cold temperature of 60° F. Therefore, thisenergy savings temperature provides a slightly cooler hot water washingtemperature. To enhance the convenience of establishing this setting,the energy saving mode is established via the coordination between theenergy saving selection and a standard hot water washing operation.

[0009] Additional objects, features and advantages of the presentinvention will become more fully apparent from the following detaileddescription of a preferred embodiment, when taken in conjunction withthe drawings wherein like reference numeral refer to corresponding partsin the several views.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010]FIG. 1 is a front perspective view of a top loading, vertical axisclothes washing appliance incorporating the energy saving controlfeature of the present invention; and

[0011]FIG. 2 is an enlarged view of a control panel portion of theclothes washing appliance of FIG. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0012] With initial reference to FIG. 1, a laundry appliance constructedin accordance with the present invention is generally indicated at 2. Asshown, laundry appliance 2 constitutes a top loading, vertical axisclothes washer. Washing appliance 2 includes an outer cabinet 5 providedwith an upper opening 8 that can be selectively closed by means of apivotable lid 12. In a manner widely known in the art, lid 12 can beraised to provide access to a rotatable basket (not shown) mountedwithin cabinet 5, with clothes to be laundered being adapted to beplaced in the basket. In the preferred embodiment shown, lid 12 includesan angled front portion 15 to enhance access to within cabinet 5.

[0013] As also shown in FIG. 2, at a rear portion of cabinet 5 isarranged a control panel 20 that includes various control units whichcan be used to program a desired laundering operation for washingappliance 2. In the preferred embodiment shown, control panel 20includes a first control unit 30 having a vertically shiftable knob 32.Knob 32 is adapted to be shifted between raised and lowered positions inorder to enable a user of washing appliance 2 to select a desired loadsize. For instance, knob 32 can be shifted between mini, medium, largeand super load capacity positions, as well as a potential resetposition.

[0014] Control panel 20 also includes a second control unit 35 that isdefined by a plurality of buttons 38-41. Second control unit 35 isprovided to establish wash and rinse temperatures. Therefore, button 38is used to establish hot/cold wash/rinse temperatures; button 39 is usedto establish warm/warm wash/rinse temperatures; button 40 is used toestablish warm/cold wash/rinse temperatures; and button 41 is used toestablish cold/cold wash/rinse temperatures respectively.

[0015] Adjacent second control unit 35 is a third control unit 45 whichis defined, in the preferred embodiment shown, by buttons 47-50. Thirdcontrol unit 45 can be used by a consumer to additionally establish anenergy saving hot wash cycle through button 47 or a super wash operationthrough the use of button 48. As will be detailed fully below afterdescribing additional structure incorporated in washing machine 2, theinvention is particularly directed to the inclusion and use of button 47to establish an energy saving wash mode for washing appliance 2. Areminder chime can be set through button 49 and, to cancel any of thesecontrol features, button 50 is provided.

[0016] Arranged next to third control unit 45 is a fourth control unit55 which is preferably provided to enable extra rinse and/or clean lightoperations to be established. More specifically, fourth control unit 55includes a button 57 for establishing an extra rinse operation for thecurrent washing operation, while a button 58 is used to turn off theextra rinse operation. In a similar manner, a button 59 is provided toselect a clean light operation and a button 60 is provided to cancelthis operation.

[0017] In addition to these operating parameters, it is also necessaryto establish both a desired cycle and operational time for a laundryoperation to be performed within appliance 2. To this end, washingappliance 2 is also shown to incorporate a fifth control unit 65including a control member 69 that preferably takes the form of arotatable knob. About control member 69 is provided graphic indiciagenerally indicated at 73 which, in the preferred embodiment shown, isessentially divided into first, second and third graphic zones 76, 80and 84 respectively. First graphic zone 76 is used in connection withestablishing a washing cycle for whites; second graphic zone 80represents a washing zone for delicate clothing articles; and thirdgraphic zone 84 represents a washing cycle selection zone for coloredgarments. As will be readily evident to the reader of this disclosure,the provision of indicia defined within zones around a rotatable knobwithin a washing machine is also quite prevalent in the art.Furthermore, the manner in which rotatable control member 69 can be usedto program the type of laundry to be washed, as well as a desiredwashing duration, is widely known in the art such that further detailsthereof will not be provided here.

[0018] Disposed between fourth and fifth control units 55 and 65 ispreferably provided an upper “Clean” light element 90 such as an LED ora neon lamp. Similarly, a light element 92 is provided to illuminatewhen an energy saving hot wash operation is established in accordancewith the invention. Finally, a chime control switch 94 that canpreferably be set between Hi, Low and Off positions, as well as afingertip faucet actuating switch 96, is arranged on an opposing side offifth control unit 65. Again, this structure is not considered part ofthe invention but is rather provided simply for the sake ofcompleteness. At this point, it should be readily apparent that theparticular structure used to program washing appliance 2 can varywithout departing from the spirit of the invention. For instance, atouch screen display or the like, such as that disclosed in pending U.S.patent application Ser. No. 09/741,067 filed Dec. 12, 2000 and entitled“Interactive Control System for a Laundry Appliance”, which isincorporated herein by reference, could be readily employed. Instead, itis merely important that the user of washing appliance 2 is providedwith controls which enable desired parameters, including water level,wash temperature, wash duration, and even clothes type, to be selected.

[0019] To this point, it should be recognized that the basic controlsassociated with first, second, fourth and fifth control units 30, 35, 55and 65 are known in the art and not considered part of the presentinvention. The same is true with respect to the use and operationassociated with buttons 48, 49 and 50. Therefore, no further details ofthese control elements will be provided here as this structure has onlybeen described for the sake of completeness. Instead, the presentinvention is particularly directed to the incorporation of controlbuttons 38 and 47, as well as the corresponding functions performed bywashing appliance 2 upon selecting an energy saving wash mode throughbutton 47 as will now be detailed more fully below. Initially, it shouldbe noted that the present invention has two main aspects. One aspectconcerns establishing a desired balance between water temperature, waterlevel, and wash performance in order to satisfy energy requirements. Thesecond aspect concerns addressing perceived consumer needs andpreferences in establishing the manner in which the overall energysaving wash mode can be activated or deactivated.

[0020] With respect to the first feature, the level and temperature ofthe water are regulated to create a synergistic result found to enablethe desired energy rating to be achieved. More specifically, inaccordance with the most preferred embodiment of the invention, whenknob 32 is used to select a mini-load capacity washing operation, a washwater level of approximately 8.25 gallons is established, while a superload capacity position results in a 19.0 gallon operation. Medium andlarge load capacities are correspondingly established between theseextreme values. Furthermore, the hot water temperature is preferablyestablished at 120° F., the warm temperature at 75° F., and the coldtemperature at 60° F. Furthermore, in accordance with the most preferredembodiment of the invention, a wash water temperature of 90° F. isprovided as a slightly cooler hot wash water temperature for theauxiliary energy saving wash mode established through button 47 as willbe discussed further below. All of these temperatures, which preferablyvary only a few degrees in accordance with the invention, areestablished by controlling hot and/or cold water inlet valves (notshown) and sensing the actual water temperature to the tub of washingappliance 2 through the use of a thermistor (also not shown). Byadjusting the opening and closing degrees of the valves, the actualtemperature is maintained within a couple degrees of these specificvalues. The regulating of water inlet valves in this general manner isknown, however, the particularly established temperatures are consideredto be an important aspect of the invention, at least in combination withthe established water level employed.

[0021] With respect to the second feature, the energy saving wash modeof the invention is preferably established by depressing button 47. Morespecifically, the energy saving hot wash mode of operation is onlyestablished when second control unit 35 is used to establish a hot washoperation by the depression of button 38, in combination with thedepression of button 47. This programming arrangement functions toilluminate light element 92 and is seen to be advantageous for variousreasons. Particularly, this arrangement enables washing machine 2 toactually be utilized in a more conventional manner in that the consumerwill not be confused in connection with selecting the wash temperatureas button 47 is not in second control unit 35. Therefore, selecting theenergy saving hot wash mode automatically establishes a “hidden” washtemperature. This arrangement essentially alters the actual hot waterwash temperature without user intervention. The overall programmingoperation is simple, as only one additional programming element, whichis preferably arranged in a section of control panel 20 dedicated tocustomizing cycle selections and which is basically remote from secondcontrol unit 35, needs to be engaged.

[0022] Based on the above, it should be readily recognized that thepresent invention establishes a particular balance between the washwater temperature and water level in order to accomplish a desiredenergy rating, as well as wash performance, in an efficient andeffective manner. Therefore, the invention establishes a particular washwater level range, in combination with a supplemental hot wash watertemperature, in order to improve the efficiency of washing appliance 2in a synergistic manner. Furthermore, the invention sets forth anadvantageous, overall programming configuration which is seen to enhancecustomer appeal and effectiveness. Although described with respect to apreferred embodiment of the invention, it should be readily understoodthat various changes and/or modifications can be made to the inventionwithout departing from the spirit thereof. Instead, the invention isonly intended to be limited by the scope of the following claims.

I/we claim:
 1. A vertical axis washing appliance adapted to receive and perform a laundering operation on a load of clothes as part of a washing operation comprising: first control means for selecting a desired water level for the washing operation; second control means for selecting a wash temperature for the washing operation; third control means for selecting a wash time for the washing operation; and means for establishing an energy saving wash mode for the washing operation wherein the wash temperature selected through the second control means is automatically reduced to a lower temperature not available through the second control means.
 2. The washing appliance according to claim 1, further comprising: a control panel, each of the first, second and third control means, as well as the means for establishing the energy saving wash mode, being exposed from the control panel, with said means for establishing the energy saving wash mode being spaced from the second control means on the control panel.
 3. The washing appliance according to claim 1, wherein the second control means enables selection of at least hot, warm and cold temperature settings for the wash temperature, and wherein the means for establishing the energy saving wash mode can only reduce the wash temperature when the hot temperature setting is selected.
 4. The washing appliance according to claim 3, wherein the lower temperature is 90° F.
 5. The washing appliance according to claim 4, wherein the hot temperature setting is 120° F.
 6. The washing appliance according to claim 3, wherein the hot and cold temperature settings differ by 60° F.
 7. The washing appliance according to claim 1, wherein the first control means enables selection of the desired water level from a maximum of 19 gallons to a minimum of 8.25 gallons.
 8. The washing appliance according to claim 7, wherein the second control means enables selection of the wash temperature from a hot wash temperature of 120° F., a warm wash temperature of 75° F., and a cold wash temperature of 60° F.
 9. The washing appliance according to claim 8, wherein the lower temperature is 90° F.
 10. A method of programming a vertical axis clothes washing appliance for a washing operation comprising: selecting a desired water level for the washing operation; selecting a wash temperature for the washing operation; selecting a wash time for the washing operation; establishing an energy saving wash mode for the washing operation; and automatically reducing the wash temperature to a lower temperature for the energy saving wash mode.
 11. The method of claim 10, further comprising: selecting between at least hot, warm and cold temperature settings for the wash temperature; and permitting the establishing of the energy saving wash mode only when the hot temperature setting is selected for the wash temperature.
 12. The method of claim 11, further comprising: establishing the lower temperature at 90° F.
 13. The method of claim 12, further comprising: establishing the hot temperature at 120° F.
 14. The method of claim 11, further comprising: establishing a difference between the hot and cold temperature settings of 60° F.
 15. The method of claim 10, further comprising: selecting the desired water level from a maximum of 19 gallons to a minimum of 8.25 gallons.
 16. The method of claim 15, further comprising: enabling selection of the wash temperature from a hot wash temperature of 120° F., a warm wash temperature of 75° F., and a cold wash temperature of 60° F.
 17. The method of claim 16, further comprising: establishing the lower temperature at 90° F. 